Could try using a utility called Konboot
. This will allow you to type in any password and access the system. Once logged in, create another Administrator account and reboot. Log into the new account and reset the password on the old account (Unfortunately you cannot change the password of the account you log into while Konboot is active, but it at least lets you get in). Keep in mind that the use of this software to gain access to any computer system you do not own is illegal. Neither myself, Bestofmedia Group or anyone else affiliated with Bestofmedia Group can be held responsible for how you use this program.